Optical to Coax converter


Does anyone know of a good optical to coax converter? I have two machines with optical out, but my d/a only has one optical in...

Thanks
zkzpb8
monarchy dip which also reduces jitter.
I think Parts Express sells one.
Anyway, I am using it on my Panasonic DVD Recorder and it seems to work fine. Cost about $25 bucks!
The monarchy looks good - I also found one from Audio Authority that automatically switches - will this affect anything, soundwise?

http://www.audioauthority.com/product_details/1177A/Digital_Audio/5/1)